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Crazy buzz on open A string

For a while my A string has been buzzing even if I don’t press any frets down. It mainly happens when I pluck it really hard and I’m not sure what’s causing it. I’ve gotten my nut replaced and action readjusted for a separate problem and I’m wondering if it has something to do with the bridge. Any help would be greatly appreciated.
 
Solution
For a while my A string has been buzzing even if I don’t press any frets down. It mainly happens when I pluck it really hard and I’m not sure what’s causing it. I’ve gotten my nut replaced and action readjusted for a separate problem and I’m wondering if it has something to do with the bridge. Any help would be greatly appreciated.
Off first hand experience the most common causes of A string rattle I've come across are those caused by an improperly slotted nut and bridge saddles that are not perfectly parallel to their bridge plate. If this is a fender style headstock there are nuances to slotting the A that most whom aproach slotting every nut the same way just simply dont follow.

The angle down to the tuner has to match the...
Take it back to the person that made it wrong, and tell them to fix it.
If you just had it done give them another chance to make it right, or go to someone else that can do the job right.

Show / demonstrate the issue. Before handing over the instrument, I'd post the suggested remediation here on TB. Some well-meaning techs are absolutely lousy diagnosticians and you don't want them hacking away on your bass.

Riis
 
I once had a strangely buzzing A-string (La Bella Low Tension Flats). Took it to my luthier and he showed me the string took a 'banana' shape when completely loosened. Our piano tuner told me later that this happens more often with strings. He always checks if there are clockwise or counter clockwise tensions which he corrects (by turning the end of the string against its unnatural twist) before putting it under tension. He is also a bass player and he told me he learned all this from John Pattituci. I tried to find his source, but did not succeed. Anyway - maybe you should have a look at that string. (I do remember people writing about twisted strings here on Talkbass.)